Operating principle

Water softener works according to the ion-exchange principle: the water flows through the tank containing resin saturated with sodium ions, the resin attracts dissolved calcium, magnesium ions and replaces them with sodium ions.

The raw water quantity flowing through the tank decreases purification ability of ion-exchange layer,therefore it must be periodically renewed by rinsing with a saturated salt solution. Saturated salt solution NaCl is obtained from the salt tablets. This process is called regeneration of the filter. Elements gathered during regeneration (Ca, Mg, and Fe) are washed up in the sewers. 

DUPLEX softeners have two pressure tanks which have been added to the water system in parallel, thereby ensuring water flows through both tanks simultaneously. When water flows through both tanks simultaneously, the softener's total capacity is twice as large as through the one tank. It is important that clean water supply to the consumer does not break during the regeneration because each tank regenerates alternately, i.e. as long as the one tank flush, the other continues to filter the incoming water. Each tank has the control unit with built-in water consumption meter and the mechanism calculating the regeneration times. All is running in automatic mode.



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